Removed non existent table from reset

Table stations was never filled, removed from the database and the
reset operations.
Added complete URL to BOT installation log
Added configuration data

Added data needed by portal.php/display_lastposts() function.
Integrated function display_lastposts

Direct call to mysql library has been replaced by sql methods.

Needed configuration information are read by $config variable.

Changed require into simple include, if the forum config file does not
exists, there will be only no connection to the DB, a warning is enough.